Jeong Yong-jun (born December 20, 1976), better known as Jang Hyuk, is a South Korean actor. He is best known for his leading roles in the films Volcano High (2001), Windstruck (2004), The Swordsman (2020), The Killer: A Girl Who Deserves to Die (2022), and the television dramas Successful Story of a Bright Girl (2002), Thank You (2007), The Slave Hunters (2010), Deep Rooted Tree (2011), You Are My Destiny (2014), Voice (2017), Money Flower (2017), Wok of Love (2018), My Country: The New Age (2019), Tell Me What You Saw (2020) and Bloody Heart (2022).